Shred is pushing away the bounderies, it includes speed, but it has other things. Allan HOLDSWORTH is a shredder, and he has pushed the limits of modern composing.
You aren't moved by shred, but it isn't its purpose!! Consider it as a quest for new things (of course, when you see that 95 percent of shredders play the same riffs and licks, it gets boring, but once in a while you find a truly innovative guy, and then, it's really cool and those guys are the true shredders, others are just wannabes)